FAMILY PSEUDOMOXADACEAE 83 



in Relation to Plant Disease, 1, 1905, 171; Dcnilromonas Orla-Jensen, Cent. f. Bakt., 

 II Abt., 22, 1909, 314; Liquidomonas Orla-Jensen, ibid., 332; Lamprella Enderlein, 

 Sitzber. Gesell. naturf. Freunde, Berlin, 1917, 317; Fluoromonas Orla-Jensen, Jour. 

 Bact.. 6, 1921, 271.) 



Cells nionotrichous, lophotrichous or non-motile. If pigments are produced, they 

 are of greenish hue, fluorescent, and water-soluble.* Gram-negative except Nos. 

 88, 122 and 128. Frequently ferment glucose, sometimes with the formation of 

 visible gas. Inactive in the fermentation of lactose. Nitrates are frequently re- 

 duced either to nitrites or ammonia, or to free nitrogen. Some species split fat and 

 attack hydrocarbons. Soil, water, and plant pathogens; very few animal pathogens. 

 Certain salt water species (Nos. 58-64) some of which live in heavy brine are tempo- 

 rarily retained in this genus although they produce non-water-soluble pigments or 

 phosphorescence. From Gr. pseudes, false; monas, a unit; M. L. monad. 



The type species is Pseudomonas aeruginosa (Schroeter) Migula. 



Key to the species of genus Pseudomonas. 



I. Soil and fresh water forms with a few that are pathogenic on cold or warm 

 blooded animals. 

 1. Green fluorescent pigment produced, 

 a. Gelatin liquefied. 



b. Polar flagellate. 



c. Grow readily at 37°C. Usually bluish-green. 



1. Pseudomonas aeruginosa. 



2. Pseudomonas jaegeri. 

 cc. Grow poorly or not at all at 37°C. 



d. Milk not coagulated becoming alkaline. 



e. Soil and water organisms. Not known to 

 digest cellulose. 



3. Pseudomonas fluorescens. 



4. Pseudomonas viscosa. 



5. Pseudomonas fairmountensis. 



6. Pseudomonas ureae. 



7. Pseudomonas pavonacea. 

 ee. Soil forms that attack cellulose. 



8. Pseudomonas effusa. 

 eee. Pathogenic for lizards. 



9. Pseudomonas reptilivorous. 



dd. ]Milk unchanged becoming blue in association with 

 lactic acid bacteria. 



10. Pseudomonas syncyanea. 

 ddd. Milk coagulated. 



11. Pseudomonas schuylkilliensis. 



12. Pseudomonas chlororaphis. 



13. Pseudomonas myxogenes. 



14. Pseudomonas septica. 

 dddd. Soil form. Action on milk not recorded. 



15. Pseudomonas boreopolis. 



* See Tobie, Jour. Boct., 49, 1945, 459 for a discussion of the nature of 

 these pigments. 



